Air leak indicator



FIG. 1 is a front top perspective view of an “air leak indicator” showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a cross-sectional view thereof taken through the line 5—5 of FIG. 2. 

The ornamental design for an “air leak indicator”, as shown and described. 